Minimum Guaranteed Hours In New Zealand Employment Agreements

If you’re hiring staff in New Zealand, one of the easiest places to run into problems (without meaning to) is around hours of work.

From a small business owner’s perspective, it’s completely normal to want flexibility - especially if your sales fluctuate, you’re staffing around seasonal demand, or you’re building a business that’s still finding its rhythm.

But flexibility needs to be set up properly in writing. In NZ, “zero-hour” style arrangements are heavily restricted, and employment agreements need to clearly set out what you’re guaranteeing, what you’re not, and how changes to hours will work.

This guide explains how minimum guaranteed hours work, what you should include in your employment agreements, and how to protect your business while staying compliant.

What Are Minimum Guaranteed Hours (And Why Do They Matter)?

Minimum guaranteed hours are the minimum number of paid hours you guarantee to an employee in a pay period (usually per week). In other words, it’s the baseline commitment you’re making that gives the employee certainty of income - and gives you clarity about your staffing obligations.

For example:

• “You are guaranteed a minimum of 30 hours per week, worked Monday to Friday between 8:30am and 5:00pm.”
• “You are guaranteed a minimum of 10 hours per week. Additional hours may be offered depending on operational needs.”

Minimum guaranteed hours matter because they affect:

• Your wage obligations: if you guarantee 20 hours, you may still need to pay for those 20 hours even if you roster fewer hours - but whether you can lawfully reduce or withhold pay in a particular situation depends heavily on your employment agreement wording and on following a fair process.
• Your ability to roster up/down: if you want genuine flexibility, you need to structure the role correctly (for example, casual vs part-time) and draft the agreement carefully.
• Your legal risk: unclear hours and “on call” expectations can lead to disputes, wage claims, and penalties.

As a general rule: if you want reliability from staff, you’ll usually need to offer reliability in return - and document it clearly in the employment agreement.

Do You Have To Provide Guaranteed Hours In NZ?

Not every employee must have a high number of guaranteed hours - but employment agreements must be clear about what is guaranteed and what is not.

NZ law restricts “zero hours” arrangements where an employee must be available for work but the employer does not guarantee any work.

In practice, most small businesses choose one of these approaches:

• Full-time employment with guaranteed hours (for example, 40 hours per week).
• Part-time employment with guaranteed hours (for example, 15–25 hours per week).
• Casual employment where there is typically no ongoing guarantee of hours, and shifts are offered as needed (but it must be a true casual arrangement, not “part-time dressed up as casual”).

Where businesses get stuck is when they try to combine the “best” parts of each option - expecting ongoing availability and commitment, while also avoiding any minimum commitment themselves. That’s exactly the type of arrangement the law is designed to prevent.

If you’re not sure what type of arrangement fits your workforce, it’s worth getting advice early - it’s much easier to set it up right from day one than to fix a dispute later. Having a properly drafted Employment Contract is usually the starting point.

What Must You Include In The Employment Agreement About Guaranteed Hours?

When you’re documenting minimum guaranteed hours, the goal is to remove ambiguity. If a clause can be read two different ways, that’s where disputes start - especially when rostering changes, business slows down, or an employee’s pay is questioned.

Here are the key items you should consider including.

1) The Minimum Guaranteed Hours (And The Pay Period)

State the exact minimum hours you guarantee and how they’re measured.

For example:

• “A minimum of 20 hours per week.”
• “A minimum of 60 hours per fortnight.”

Be careful here: “hours per fortnight” can sound flexible, but it can also create confusion if employees expect consistency week-to-week. If your business genuinely needs variable weekly rostering, you can still document a fortnightly minimum - you just want to be very clear about how rostering will work.

2) Days Of Work And Typical Work Patterns

If the role is reasonably predictable (many are), specify the typical days and hours of work. This helps manage expectations and can reduce pushback when you roster within the agreed span.

For example:

• Days of the week (e.g. Monday to Friday)
• Time bands (e.g. between 7am and 7pm)
• Whether weekend work may be required

If you can’t guarantee a fixed pattern, it’s still helpful to set out the “span of hours” the employee may be rostered within, and the notice you’ll provide for rosters.

3) How Additional Hours Will Be Offered (And Whether They’re Guaranteed)

Many small businesses guarantee a base level (say 15 hours) and then offer extra hours when it’s busy.

If that’s your model, say so clearly. For example:

• Additional hours may be offered by agreement.
• Additional hours are not guaranteed.
• How acceptance works (e.g. employee can accept/decline, subject to reasonable requirements).

This is also where it helps to think about overtime, penalty rates (if any), and how you’ll handle time off in lieu if you offer it. If you’re implementing TOIL, your employment terms should line up with your payroll practices and your record-keeping. (This is often a good time to review how your business approaches Time Off In Lieu.)

4) Availability Expectations (If Any)

This is a big one.

If you want an employee to be available for work outside their guaranteed hours (for example, you want to be able to call them in for extra shifts), you need to be careful. Availability obligations are not something to “slip in” informally - the law has specific rules around availability provisions.

In general terms, if you want to include an availability provision in an employment agreement, it should be there for genuine reasons based on the nature of the work, and it needs to be documented clearly - including what availability is required, when it applies, and what compensation (if any) is paid for being available. The employee should also be able to decline work offered outside their guaranteed hours unless there are proper, enforceable terms in place.

At a practical level, if you:

• expect availability, and
• penalise employees for not being available, or
• create an ongoing expectation that they must keep themselves free,

you may be creating legal risk unless it’s properly documented, justified, and compensated in line with the rules.

In many cases, the simplest approach is: guarantee the hours you need reliably, and treat additional shifts as genuinely optional (or rostered with agreement).

5) How Rosters Are Set And How Much Notice You’ll Give

Rosters are often where conflicts begin - not because anyone is acting badly, but because expectations aren’t aligned.

Consider including:

• how far in advance rosters will be issued (e.g. 7 or 14 days)
• how shift changes will be communicated
• rules for swapping shifts
• what happens if business needs change unexpectedly (e.g. sickness, urgent demand, or quiet periods)

Clear rostering terms won’t fix every issue, but they do make it much easier to show you’ve acted reasonably and consistently.

How Do Guaranteed Hours Work For Part-Time Vs Casual Employees?

This is one of the most common questions we see from small businesses - and it’s also one of the most important to get right if you want flexibility without accidental non-compliance.

Part-Time Employees

Part-time employees usually have:

• ongoing employment
• a regular pattern (or at least regular minimums)
• minimum guaranteed hours (even if modest)

If someone is effectively working the same days every week, or you rely on them as core staff, they’re very likely part-time (or full-time), not casual - even if you call them casual in the agreement.

That classification matters because it impacts things like leave entitlements and how changes can be made.

Casual Employees

Casual employment can be appropriate when your staffing needs are genuinely intermittent and there is no ongoing expectation of work.

However, if a casual employee ends up working regular hours over time, they may start to look (legally and practically) like a permanent employee. This can create disputes around leave and other entitlements.

It’s worth making sure you understand how leave works for casual staff and whether your arrangement is truly casual. If your workforce includes casual staff, reviewing your approach to Casual Workers’ Leave Entitlements can help you avoid surprises.

If you’re trying to decide between part-time and casual for a role, a good question to ask is:

• “Do we need ongoing commitment and predictability from this person?”

If the answer is yes, a part-time agreement with clear minimum hours is often the safer (and more sustainable) option.

Can You Change Minimum Guaranteed Hours Later?

Sometimes your business changes - you lose a major client, your lease changes, you expand trading hours, or you need to restructure shifts.

The tricky part is this: you generally can’t unilaterally reduce an employee’s guaranteed hours unless your agreement and the circumstances allow it and you follow a fair process (including consultation). In many cases, reducing guaranteed hours will require the employee’s agreement.

Reducing guaranteed hours usually involves a variation to the employment agreement, which requires agreement between you and the employee.

From a practical standpoint, if you think you may need to reduce hours in the future, you should set expectations early and draft the agreement carefully - but you still can’t “contract out” of key employee protections.

If you’re currently in a situation where you need to cut back shifts, take a look at Reducing Staff Hours - because the way you approach it (process and documentation) is often just as important as the reason.

What About Trial Periods And Review Clauses?

Some businesses try to manage risk by offering low guaranteed hours at the start, with a “review after 3 months.” This can work in the right context - but it needs to be genuine, clearly drafted, and applied consistently.

A review clause doesn’t automatically mean you can reduce or increase hours however you like. It usually just sets an expectation that the parties will revisit the arrangement.

If you want true flexibility, you’re better off designing the role properly from the beginning (for example, casual where genuinely appropriate, or part-time with a realistic minimum).

Common Mistakes Employers Make With Minimum Guaranteed Hours

Most problems we see in this area come from good intentions and rushed documentation - not from employers trying to do the wrong thing.

Here are some common traps to avoid.

1) Setting Guaranteed Hours Too Low To “Stay Flexible”

If you guarantee 5 hours but roster 25 hours every week, it can look like the guaranteed hours aren’t reflecting reality.

Over time, the “real” arrangement may be argued to be higher than what’s on paper - and that’s when wage, leave, and expectation disputes can pop up.

2) Using “Casual” As A Catch-All

Calling someone casual doesn’t automatically make them casual. If they work a regular pattern and you rely on them week after week, you may be dealing with a permanent employment relationship.

3) Adding Availability Expectations Without Proper Structure

Wanting staff to be available “just in case” is common in hospitality, retail, trades, and service businesses. The risk is when you build an expectation that they must keep themselves free without guaranteeing work (or without properly documenting, justifying, and compensating the arrangement).

4) Not Aligning Hours Clauses With Overtime Or TOIL Practices

If employees regularly work beyond their guaranteed hours, you should be clear on whether those extra hours are:

• paid at the standard rate
• treated as overtime (and what “overtime” means in your business)
• eligible for TOIL (and how TOIL is accrued and taken)

If you want a deeper look at the practical side of this, it’s worth reviewing your approach to Working Overtime, especially if you’ve got mixed rosters and changing peak periods.

5) Trying To “Stand Down” Employees Without Clear Contract Terms

When it’s quiet, some businesses assume they can simply send employees home unpaid. Whether that’s lawful depends on the employment agreement (including any stand-down clause, if you have one), the reason for the stand-down, and how you follow any required process.

If you’re thinking about sending staff home due to lack of work, it’s important to understand the rules around Employee Stand Down, because getting this wrong can quickly turn into a wage claim.

Key Takeaways

• Minimum guaranteed hours are the baseline hours you commit to paying an employee for, and they should be clearly stated in the employment agreement.
• Your agreement should explain the minimum hours, the pay period, the typical working pattern, and how rostering and changes will work in practice.
• If you offer extra shifts above the minimum, clearly state whether those additional hours are optional and not guaranteed.
• Be careful with availability expectations - requiring availability without guaranteeing work is a high-risk area and usually needs a properly drafted availability provision (with genuine reasons and appropriate compensation).
• If someone works regular hours over time, they may no longer be truly casual, which can affect leave entitlements and ongoing obligations.
• You generally can’t reduce guaranteed hours informally - changing hours often requires a proper variation process, consultation, and agreement.

Note: This article is general information only and isn’t legal advice. Employment obligations can vary depending on the agreement terms and your specific situation.

If you’d like help drafting or reviewing an employment agreement that properly covers minimum guaranteed hours (without losing the flexibility your business needs), we’re here to help. You can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.